Cryogenic engineering is the application of low-temperature science to practical problems. The lower end of the cryogenic scale is conveniently fixed at absolute zero. The upper end of the cryogenic region is less specific but certainly less than any natural temperature recorded on earth. Minus 150°C, where some common gases condense and form liquids, is a useful working value. This upper limit is purely one of choice, since there is no single outstanding event that clearly defines it.
KeywordsLiquid Helium Josephson Junction Superconducting Magnet Liquid Hydrogen Liquid Oxygen
Unable to display preview. Download preview PDF.